// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-generator-function-definitions-runtime-semantics-evaluation
es6id: 14.4.14
description: >
  `value` property is not accessed when iteration is incomplete
info: |
  YieldExpression : yield * AssignmentExpression

  1. Let exprRef be the result of evaluating AssignmentExpression.
  2. Let value be ? GetValue(exprRef).
  3. Let iterator be ? GetIterator(value).
  4. Let received be NormalCompletion(undefined).
  5. Repeat
     a. If received.[[Type]] is normal, then
        i. Let innerResult be ? IteratorNext(iterator, received.[[Value]]).
        ii. Let done be ? IteratorComplete(innerResult).
        iii. If done is true, then
             1. Return ? IteratorValue(innerResult).
features: [generators, Symbol.iterator]
---*/

function Test() {
    var badIter = {};
    var callCount = 0;
    var spyValue = Object.defineProperty({ done: false }, 'value', {
      get: function() {
        callCount += 1;
      }
    });
    badIter[Symbol.iterator] = function() {
      return {
        next: function() {
          return spyValue;
        }
      };
    };
    var delegationComplete = false;
    function* g() {
      yield * badIter;
      delegationComplete = true;
    }
    var iter = g();

    iter.next();
    assert.sameValue(callCount, 0, 'access count (first iteration)');
    assert.sameValue(
      delegationComplete, false, 'delegation ongoing (first iteration)'
    );

    iter.next();
    assert.sameValue(callCount, 0, 'access count (second iteration)');
    assert.sameValue(
      delegationComplete, false, 'delegation ongoing (second iteration)'
    );

    spyValue.done = true;
    iter.next();
    assert.sameValue(callCount, 1, 'access count (final iteration)');
    assert.sameValue(delegationComplete, true, 'delegation complete');
}

// preheat
const NUMBER_OF_PREHEAT = 1;
for (let i = 0; i < NUMBER_OF_PREHEAT; i++) {
    Test();
}

ArkTools.jitCompileAsync(Test);
assert.sameValue(ArkTools.waitJitCompileFinish(Test), true, '[JIT] JIT disabled.');

// test
const NUMBER_OF_TEST = 1; // or 2
for (let i = 0; i < NUMBER_OF_PREHEAT; i++) {
    Test();
}
